gml:EngineeringCRS is a contextually local coordinate reference system which can be divided into two broad categories:- earth-fixed systems applied to engineering activities on or near the surface of the earth;- CRSs on moving platforms such as road vehicles, vessels, aircraft, or spacecraft, see ISO 19111 8.3.
The attribute gml:id supports provision of a handle for the XML element representing a GML Object. Its use is mandatory for all GML objects. It is of XML type ID, so is constrained to be unique in the XML document within which it occurs.
Source
<element name="EngineeringCRS" type="gml:EngineeringCRSType" substitutionGroup="gml:AbstractSingleCRS"><annotation><documentation>gml:EngineeringCRS is a contextually local coordinate reference system which can be divided into two broad categories: - earth-fixed systems applied to engineering activities on or near the surface of the earth; - CRSs on moving platforms such as road vehicles, vessels, aircraft, or spacecraft, see ISO 19111 8.3.</documentation></annotation></element>